• 'A United States project lasting from August 1942 to August 1946, which developed the atomic energy program, with special reference to the atomic bomb.' MP:
  • According to Wikipedia, it was the period between 1941-1946.
  • The Manhattan project's lifespan was 1941 - 1946, with the purpose of developing nuclear weapons. The idea germinated in the 1930s when it was feared that the Nazis were developing nuclear power.

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